shm.cpp File Reference

#include <Mm/shm.h>
#include <Mm/kmalloc.h>
#include <Mm/pmmngr.h>
#include <Mm/vmmngr.h>
#include <Hal/x86_64_hal.h>
#include <Hal/serial.h>
#include <Sync/spinlock.h>
#include <list.h>
#include <aucon.h>
#include <_null.h>
#include <string.h>

Include dependency graph for shm.cpp:

Functions
void	AuInitialiseSHMMan ()
	AuInitialiseSHMMan – initialise shm manager.
uint16_t	AuSHMGetID ()
AuSHM *	AuGetSHMSeg (uint16_t key)
AuSHM *	AuGetSHMByID (uint16_t id)
int	AuCreateSHM (AuProcess *proc, uint16_t key, size_t sz, uint8_t flags)
	AuCreateSHM – create a new shared memory segment or returns previously allocated one.
void	AuSHMDelete (AuSHM *shm)
size_t	AuSHMProcBreak (AuProcess *proc, size_t num_frames)
void	AuSHMProcSwap (dataentry *current, dataentry *index)
void	AuSHMProcOrderList (AuProcess *proc)
void *	AuSHMObtainMem (AuProcess *proc, uint16_t id, void *shmaddr, int shmflg)
	AuSHMObtainMem – obtains a virtual memory from given shm segment.
void	AuSHMUnmap (uint16_t key, AuProcess *proc)
	AuSHMUnmap – unmaps a shared memory segment.
void	AuSHMUnmapAll (AuProcess *proc)
	AuSHMUnmapAll – unmaps all mappings for this process.

Variables
list_t *	shm_list
uint16_t	shm_id
Spinlock *	shmlock

Function Documentation

AuCreateSHM()

int AuCreateSHM	(	AuProcess *	proc,
		uint16_t	key,
		size_t	sz,
		uint8_t	flags
	)

AuCreateSHM – create a new shared memory segment or returns previously allocated one.

Parameters

proc	– Creator process
key	– unique key to use
sz	– size in multiple of PAGE_SIZE
flags	– security flags

Returns

id of newly created SHM, -1 on failure

AuGetSHMByID()

AuSHM * AuGetSHMByID

(

uint16_t

id

)

AuGetSHMSeg()

AuSHM * AuGetSHMSeg

(

uint16_t

key

)

AuInitialiseSHMMan()

void AuInitialiseSHMMan

(

)

AuInitialiseSHMMan – initialise shm manager.

AuSHMDelete()

void AuSHMDelete

(

AuSHM *

shm

)

AuSHMGetID()

uint16_t AuSHMGetID

(

)

AuSHMObtainMem()

void * AuSHMObtainMem	(	AuProcess *	proc,
		uint16_t	id,
		void *	shmaddr,
		int	shmflg
	)

AuSHMObtainMem – obtains a virtual memory from given shm segment.

Parameters

proc	– Calling process
id	– shm segment id
shmaddr	– starting shared memory address to map @parma shmflg – flags

Returns

starting address of this shm on success, NULL on failure

AuSHMProcBreak()

size_t AuSHMProcBreak	(	AuProcess *	proc,
		size_t	num_frames
	)

AuSHMProcOrderList()

void AuSHMProcOrderList

(

AuProcess *

proc

)

AuSHMProcSwap()

void AuSHMProcSwap	(	dataentry *	current,
		dataentry *	index
	)

AuSHMUnmap()

void AuSHMUnmap	(	uint16_t	key,
		AuProcess *	proc
	)

AuSHMUnmap – unmaps a shared memory segment.

Parameters

key	– key to search
proc	– process to look

AuSHMUnmapAll()

void AuSHMUnmapAll

(

AuProcess *

proc

)

AuSHMUnmapAll – unmaps all mappings for this process.

Parameters

proc	– Pointer to process that needs unmapping

Variable Documentation

shm_id

uint16_t shm_id

shm_list

list_t* shm_list

BSD 2-Clause License

Copyright (c) 2022-2023, Manas Kamal Choudhury All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

shmlock

Spinlock* shmlock